Tractor cab



FIG. 1 is a front and right side perspective view of a tractor cab showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a front elevational view thereof; and

FIG. 6 is a left side elevational view thereof.

The portion of the tractor shown in broken lines in FIGS. 1-4 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a tractor cab, as shown and described. 